In today’s telecommunication markets, Cisco 40GBASE QSFP+ modules offer customers a wide variety of high-density and low-power 40 Gigabit Ethernet connectivity options for data center, high-performance computing networks, enterprise core and distribution layers, as well as service provider transport applications. In order to help customers have a deeper understanding about the 40G QSFP+ modules, this article will introduce several kinds of connectivity options provided by Cisco.